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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statements of Income [Abstract]    
OPERATING REVENUES: $ 15,401 $ 14,240
OPERATING EXPENSES:    
Operation and maintenance 4,112 3,451
Administrative and general 2,666 2,657
Depreciation and amortization 2,814 2,480
Taxes other than income taxes 391 354
Operating expenses 9,983 8,942
Operating income 5,418 5,298
OTHER INCOME (EXPENSES):    
Interest on debt (1,513) (1,297)
Allowance for funds used during construction 749 295
Other pension costs (364) (319)
Other income (expenses), net (94) (349)
Other income (expenses) (1,222) (1,670)
Income before income taxes 4,196 3,628
Income tax (benefit) expense 543 (231)
Net Income $ 3,653 $ 3,859
Basic Earnings Per Share (in dollars per share) $ 0.26 $ 0.29
Diluted Earnings Per Share (in dollars per share) $ 0.26 $ 0.29